It will probably flow just like that (maybe increasing a bit more) until your milk comes in. For some women, once the milk comes in, it's like someone turned a faucet on!
I'm prepared this time with LOTS of breastpads. For me, the way colostrum flowed and the way breastmilk flowed were not comparable.
ETA: I never got letdowns with just colostrum. The letdowns didn't start until my milk came.

ETA: I never got letdowns with just colostrum. The letdowns didn't start until my milk came.